package password;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.logging.Level;
import java.util.logging.Logger;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

//import org.apache.commons.codec.binary.Base64; 
//Android导入此包会发生错误
//java.lang.NoSuchMethodError: org.apache.commons.codec.binary.Base64.encodeBase64String
//Android还是有问题
//放弃此方式

/**
 * AES加密工具类
 */
public class AES {
	public static void main(String[] args) {
		System.out.println(encrypt("1", encryptPassWord));
	}

	private static final String KEY_ALGORITHM = "AES";
	private static final String DEFAULT_CIPHER_ALGORITHM = "AES/ECB/PKCS5Padding"; // 默认的加密算法
	public static final String encryptPassWord="LdfbAo1S8DggjjB1A5saYw==";

	/**
	 * AES 加密操作
	 *
	 * @param content 待加密内容
	 * @param password 加密密码
	 * @return 返回Base64转码后的加密数据
	 */
	public static String encrypt(String content, String password) {
		try {
			Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);// 创建密码器

			byte[] byteContent = content.getBytes("utf-8");

			cipher.init(Cipher.ENCRYPT_MODE, getSecretKey(password));// 初始化为加密模式的密码器

			byte[] result = cipher.doFinal(byteContent);// 加密

			return AesCBC.encodeBase64(result);
//			return Base64.encodeBase64String(result);// 通过Base64转码返回
		} catch (Exception ex) {
			Logger.getLogger(AES.class.getName()).log(Level.SEVERE, null, ex);
		}

		return null;
	}

	/**
	 * AES 解密操作
	 *
	 * @param content
	 * @param password
	 * @return
	 */
	public static String decrypt(String content, String password) {

		try {
			// 实例化
			Cipher cipher = Cipher.getInstance(DEFAULT_CIPHER_ALGORITHM);

			// 使用密钥初始化，设置为解密模式
			cipher.init(Cipher.DECRYPT_MODE, getSecretKey(password));

			// 执行操作
//			byte[] result = cipher.doFinal(Base64.decodeBase64(content));
			byte[] result = cipher.doFinal(AesCBC.decodeBase64(content));

			return new String(result, "utf-8");
		} catch (Exception ex) {
			Logger.getLogger(AES.class.getName()).log(Level.SEVERE, null, ex);
		}

		return null;
	}

	/**
	 * 生成加密秘钥
	 *
	 * @return
	 */
	private static SecretKeySpec getSecretKey(final String password) {
		// 返回生成指定算法密钥生成器的 KeyGenerator 对象
		KeyGenerator kg = null;

		try {
			kg = KeyGenerator.getInstance(KEY_ALGORITHM);

			// AES 要求密钥长度为 128
			kg.init(128, new SecureRandom(password.getBytes()));

			// 生成一个密钥
			SecretKey secretKey = kg.generateKey();

			return new SecretKeySpec(secretKey.getEncoded(), KEY_ALGORITHM);// 转换为AES专用密钥
		} catch (NoSuchAlgorithmException ex) {
			Logger.getLogger(AES.class.getName()).log(Level.SEVERE, null, ex);
		}

		return null;
	}

}